Gas boiler K+A

for heating onlywall-mountedresidential

Wall hung, Low NOx (class 6), condensing gas boiler, with total premix burner - room sealed - electronic ignition and continuous modulation, with D.H.W. production, IPX5D, Certified ErP Class A Certified ErP class A+ System (ηs > 98%) with optional “A+ KIT” composed by wireless modulating room thermostat + outdoor sensor compensation (Class VI +4%) Output: 20 kW heating / 33 kW D.H.W. High soundproofing: only 39 dB (front and side panels with double high density plastic coating) Patented Heat Exchanger/Condenser in Al/Si/ Mg alloy Electronic ignition and flame control through a single electrode Modulation ratio until 1: 8 Total premix burner with constant combustion ratio with electropneumatic modulating gas valve and modulating fan Regulation of minimum output in heating mode Secondary plate heat exchanger in stainless steel, with 18 plates with the “thermal length” optimized for the condensation Quick DHW production, thanks to the increase of the plates number of the DHW heat exchanger HWS “Hot Water Speed”: to eliminate the delay in DHW production Two zones Management: high / low temperature with differentiated priority Electronic antifreeze protection Guaranteed operation up to -15° Pump anti-jamming function Pump overrun function Safety limit thermostat Flow temperature sensor Return temperature sensor D.H.W. temperature sensor (only for model K+ “C”) High efficiency modulating pump directive conforming to the Erp 2015 Expansion vessel of 10 litres capacity Automatic air vent Safety pressure switch against the lack of water Safety pressure relief valve at 3 bar Panel board with potentiometric temperature adjustment and functions selector equipped with display